This paper describes a thoroughly integrated design procedure and an example of its application, carried out in order to define the propeller of a twin screw fast ship.

As particular attention had to be paid to fulfil many contractual requirements, such as the propulsion efficiency, cavitation and related phenomenal pressures induced on the hull vibrations and noise, both lifting line and surface effect theories for the propeller design and behaviour prediction were employed. A wide program of model tests was carried out for checking· and optimizing the propeller design, so that propulsion, cavitation and noise aspects were investigated. Then a full scale optimization program was planned and carried out in order to ascertain the expected differences between model and full scale propellers behaviour.

As a final step, the optimum full scale propeller was developed and submitted to a complete experimental test program, thus obtaining all necessary data for comparing theoretically predicted, model and full scaly propeller behavior. All results deduced from the abovementioned program steps are presented and discussed in the paper where a brief description of theoretical and experimental methodologies is also given.

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